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LT4256-3IGN bảng dữ liệu(PDF) 18 Page - Linear Technology

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LT4256-3IGN bảng dữ liệu(HTML) 18 Page - Linear Technology

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LT4256-3
18
42563f
APPLICATIO S I FOR ATIO
Figure 18. Recommended Component Placement
Layout Considerations
To achieve accurate current sensing, a Kelvin connection
to the current sense resistor (R5 in typical application
circuit) is recommended. Note that 1oz copper exhibits a
sheet resistance of about 530
µΩ/ . Small resistances can
cause large errors in high current applications. Noise
immunity will be improved significantly by locating resis-
tor dividers close to the pins with short VCC and GND
traces. The minimum trace width for 1oz copper foil is
0.02" per amp to make sure the trace stays at a reasonable
temperature. 0.03" per amp or wider is recommended.
Figure 18 shows a layout that meets these requirements.
C1
42563 F18
VOUT
VIN
GND
R8
R7
R5
Q1
D1
R6
R9
R3
R1
D2
R2
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